Experimental investigation of the unsteady rotor aerodynamics of a transonic turbine stage

This paper describes some results of a large experimental programme on unst eady flow through the rotor of a transonic turbine stage in the large Compr ession Tube Turbine Facility at the von Karman Institute for Fluid Dynamics . The tests were carried out as part of a Brite EURAM project. The test pro gramme covered the investigation of the effects of a variation in the rotat ional speed of the rotor, the axial stator-rotor distance and the stator tr ailing-edge coolant flow ejection. The paper aims at presenting the measure ments of the relative inlet total pressure and the rotor blade surface pres sure at rotor mid-span.